package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor{

        @Autowired
        private JwtProperties jwtProperties;

        /**
         * 校验jwt
         *
         * @param request
         * @param response
         * @param handler
         * @return
         * @throws Exception
         */
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            //判断当前拦截到的是Controller的方法还是其他资源
            if (!(handler instanceof HandlerMethod)) {
                //当前拦截到的不是动态方法，直接放行
                return true;
            }

            //1、从请求头中获取令牌
            String token = request.getHeader(jwtProperties.getUserTokenName());

            //2、校验令牌
            try {
                log.info("jwt校验:{}", token);
                Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
                Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
                BaseContext.setCurrentId(userId);
                log.info("当前用户id：", userId);
                //3、通过，放行
                return true;
            } catch (Exception ex) {
                //4、不通过，响应401状态码
                response.setStatus(401);
                return false;
            }
        }
}
